According to his autobiography "The Man Who Created Halloween," Yablans may not have pushed for the creation of the holiday staple if it weren't for the interference of his younger brother, Frank.
Yablans worked primarily as a salesman and distributor at Paramount and Warner Bros. studios. While at Paramount, he turned down an opportunity to oust and take over his boss' position as VP manager of sales. The man who eventually took over was his younger brother Frank, a longtime Disney employee.
Frank asked his brother to work as a production assistant. The adjustment, though difficult at first, was probably the best thing that ever happened to him.
After ending his contract at Paramount, Yablans left the major studios to run an independent studio Compass International Pictures, which led to his eventual meeting with the real-life Michael Myers and the creation of "Halloween."